ASTM_D_1679_-_02.pdf

Designation:D 1679 02An American National StandardStandard Specification forSynthetic Rubber Heat-and Moisture-Resisting Insulation forWire and Cable,75C Operation1This standard is issued under the fixed designation D 1679;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers a crosslinked rubber insulatingcompound for electrical wires and cables.The polymer con-sists substantially of synthetic rubber.1.2 This type of insulation is suitable for continuous opera-tion at conductor temperatures not exceeding 75C in dry orwet locations and operating voltages not exceeding 2000 V.This insulation may have low-temperature limitations.Consultthe manufacturer for specific recommendations for installationor application.1.3 Whenever two sets of values are presented,in differentunits,the values in the first set are the standard,while those inparentheses are for information only.1.4 In many instances the insulation material cannot betested unless it has been formed around a conductor or cable.Therefore,tests are done on insulated wire or cable in thisdocument solely to determine the relevant property of theinsulation material and not to test the insulated conductor orcompleted cable.2.Referenced Documents2.1 ASTM Standards:D 470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and Cable2D 1711 Terminology Relating to Electrical Insulation23.Terminology3.1 Definitions:For definitions of terms used in this speci-fication,refer to Terminology D 1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging(act of),nexposure of materials to the follow-ing:air at 80 psi(0.55 MPa)and 127C for 20 h;exposure tooxygen at 300 psi(2.1 MPa)and 80C for 168 h.4.Physical Properties4.1 Requirements for physical properties are listed in Table1.4.2 Thickness of InsulationTable 1 A(Conductor Sizes,Insulation Thicknesses and AC Test Voltages for RubberInsulations)of Test Methods D 470 lists the average thicknessfor the insulation.The required minimum thickness is at least90%of that given in Table 1 A(Conductor Sizes,InsulationThicknesses and AC Test Voltages for Rubber Insulations)ofTest Methods D 470.5.Electrical Requirements5.1 Order of TestingPerform the ac voltage,insulationresistance,and dc voltage tests in that order when any of thesetests are specified.The sequence of other testing is notspecified.5.2 AC Voltage TestTest each insulated conductor for 5min at the ac withstand test voltage given for ozone-resistinginsulations in Table 1 A(Conductor Sizes,Insulation Thick-nesses and AC Test Voltages For Rubber Insulations)of TestMethods D 470 under the columns labelled“Other ThanOzone-Resisting Insulations.”Unless otherwise specified,omitthis test for nonshielded conductors rated up to 5000 V if the dcvoltage test described in 5.4 is to be performed.5.3 Insulation Resistance:5.3.1 The insulated conductor shall have an insulationresistance value of at least that which corresponds to a constantof 4000 MV-1000 ft(305 m)at 60F(15.6C).5.3.2 If the temperature at the time measurement was madediffers from 60F(15.6C),correct the insulation resistance to60F.Table 2(Temperature Correction Factors for InsulationResistance at 60F)of Test Methods D 470 contains thecorrection factors.Each insulation manufacturer can furnishthe 1F coefficient for the insulation material by using theprocedure given in Test Methods D 470.Multiply the measuredvalue by the correction factor to obtain the insulation resistancevalue corrected to 60F.5.3.3 If a nonconducting separator is applied between theconductor and insulation or if an insulated conductor is coveredwith a nonmetallic jacket so that the insulation resistance canbe measured only on the completed assembly,the required1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.18 on Solid Insulations,Non-Metallic Shieldings and Coveringsfor Electrical and Telecommunication Wires and Cables.Current edition approved March 10,2002.Published June 2002.Originallypublished as D 1679 59 T.Last previous edition D 1679 97.2Annual Book of ASTM Standards,Vol 10.01.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.insulation resistance shall be at least 60%of that required forthe primary insulation based on the thickness of that insulation.5.4 DC Voltage Test(Cables Rated at 5000 V or Less)Unless otherwise specified,omit this test if the ac voltage testdescribed in 5.2 has been performed.After completion of theinsulation resistance test,test each nonshielded conductor ratefor service up to 5000 V for 5 min at the dc test voltage givenfor other than ozone-resisting i